Stovepipe-elbow.



No. 853Mo. PATBNTBD MAY 14, 1907. J. P. POSTER.

sTovBPIPB ELBGW.

PPLIOA'I'ION PILED JULY 28, 1R04.

nl: Manns rlrnzs sa. wnsmlyuram n. c4

UNITED STATES PATENT OFFICE.

STOVEPIPE-ELBOW.

Specification of Letters VPatent.

Patented May 14, 1907.

Application lcd July 26, IlQG. Serial No. 213,227.

.T0 (all 10h-om, t muy concern.'

Be it known that l, JAMns F. FOSTER., a citizen of the United States, residing at Buffalo. in the county of Erie and State of New York, have invented a new and useful lmprovement in StoVepipe-Elbows, of which the following is a specification.

This invention relates to that class of pipe elbows, particularly stove ipe elbows, which arc made of one piece ofj sheet metal and have erimps or eorrugations in their middle or curved portion extending either partially or entirelyr around the elbow. Heretofore these elbows have been made with their straight end portions smooth or uncorrugated for vthe purpose of enabling the elbow to be readily fitted to the adjoining pipe. These smooth Vend portions unless the elbow is made of verjT heavy material, become easily dented and bent out of shape in handling and transportation so that when the elbow is put up for useJ great dillicultqyv is experienced in fitting the elbow snugly to the adjoining pipe and securing a smoke proof joint.

The object of my invention is to provide an elbow the end portions of which will retain their circumferential shape and possess strength and rigidity and at the same time the el ow by reason thereof can be produced from a much lighter and cheaper grade of material than is now used.

in the accompanying drawings: Figure l is a side elevation of a stove pipe el ow embodying my invention. Fig. 2 is an end View of the same. Fig. 3 is an enlarged longitudinal section of the lower portion thereof.

Like letters of reference refer to like parts in the several figures.

A is a stove pipe elbow of the class described having radial eorrugations e e, eX- tending cireumferentiall;T from the throat to the outer side of 4the elbow. These corrugations are preferably pressed together at the inner or throat side ofthe elbow and take up the surplus metal reduced by bending the pipe to form the e bow. Their number, arrangement and extent dependupon the nature of the bend to be given to the elbow and may differ more or less in different elbows. Between these eorrugations and each end, the pipe is straight and has heretofore been left smooth and uneorrugated except in the upper end where sometimes short lungih tudina crimps b, Fig. 2, are sometimes inserted to permit the elbow to be more easilyv fitted wit 1in the adjoining pipe. In these straight and uneorrugated end portions of the elbow are arranged a series of small beads or eriinps e c extending circo:nferentially around the elbow. in that portion adapted to be fitted over the adjoining pipe, generally the lower portion, these beads project outwardijT as shown at c, Figs. 1 and 3, so as to form no obstruction on the inner side of the elbow, while in that portion adapted to be fitted within the adjoining pipe, generally the upper portion, the bead projects inwardly as shown at c". Fig. 1, so as to form no obstruction on the outer side of the elbow. By this arrangementI the beads do not project on that side of the elbow which cornes in contact with the adjoining pi e and therefore permit a close fitting joint etween the two to be made. These beads may be formed in the metal at any desirable time during the process of manufacturing the elbow, either when the metal is in the blank. or after the pipe is formed, or after the elbow is made, and ang,T suitable beading machine may be employed for such purpose. it is desirable to place one of these beads as near each end of the elbow as ossible and when the end is crimped longitudinally the bead is placed adg'acent to these crimps. These beads give strength and rigiditv to the end portions of the elbow and hold the same in shape. TheyT thus permit the adjoining pipe to be easilyr fitted thereto and a close fitting joint se cured. The number of beads ein loyed is determined' by the character of tiexmetal used, a lighter grade of metal requiring a greater number of beads to give the elbow the necessary strength and rigidity. At the end of the elbow which is provided with longitudinal erimps l) a single circumferential bead c is usually sullicient. lt is obvious that this improvement is not limited to the particular Yforni ol` elbow shown in the (lrawsaid beads projecting inwardly in one ol' said io ings but (aan ho applied to any elbow having end portions and outwardly in the otl1c1',eub a smooth unoorrugaited end portion. stantially as set forth.

1 oluini as my inveiiitionz# l Witness my hand this. 20th day of July,

A sheet metal elbow having a Curved body I 1.904.

portion and straight end portions, said ond JAMES F. FUVER.

portions having bonds formed therein which litnessesz extend. around the saine and are of uniform (J. B. I'IORNBEGK.,

size throughout the circumference thereof, t E. (l. HARD. 

